charging

I have a 02 star 1100 the battery died juring a cold weather starting recently so attached a charger and that did not seem to make a difference, I then proceeded to boost it with another battery which worked. now I replaced the battery earlier in the summer so that should not be my problem, tested the battery it shows 12 volts not running and 14 volts running however when I turn the key on without the booster battery the bike seems to lose all electrical power and will not start but when booster connected it starts easily. all connections to battery are tight. any ideas on possible problems?